Robo3D low profile 40mm fan duct

EDIT: The best way to secure the duct to the bracket is an 18mm long piece of 6mm (or 1/4") aluminium bar tapped for the M3 bolt in the middle (see pics). Works brilliant. Credit goes to [58webbing](http://www.thingiverse.com/58webbing/about)

Since I installed my Heaxagon hotend I've been working on a low profile fan duct design that could also be used for the E3D and other hotends. This design easily fits with the Hexagon, as shown, and is angle adjustable. The bracket attaches screwless